lecture38_chem110_sas

lecture38_chem110_sas - Chemical Reactions: Thermochemistry...

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Chemical Reactions: Thermochemistry Part 1 CH110 FA11 SAS 1 Prepare for Recitation December 1 st ALEKS Objective 13 due November 29 th ANGEL Quiz 13, December 1 st Lecture 37: November 16 th Lecture 38: November 18 th (Thanksgiving Break) Lecture 39: November 28 th Read: Ch. 4.6,10.5 (Reactions); 5.3 – 5.7, 8.8 (Thermo) Additional Preparation: Packet Rxns : 12-18 BLB 10: 57 BLB 5: 4,17,29,37,39, 53,55,83,85; Packet 5: 1-7 BLB 8: 65a,67ac,92a; 18: 72ab,74; Packet 8: 12-14
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CH110 FA11 SAS 2 By the end of Today’s Lecture you should know: First Law of Thermodynamics Heat, work, Energy, and Enthalpy Thermochemical Equations Heat of Formation KEY QUESTIONS: THE BIG PICTURE Chemical Reactions: Thermochemistry Part 1 How can chemical thermodynamics help me to understand the energy of reactions? What is enthalpy and why is it often more useful than energy in chemistry? Remember: Energy is stored in molecules. How can we use it? What is the relationship between a balanced chemical equation and a thermochemical equation? How do thermochemical equations help me understand reaction chemistry?
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First Law of Thermodynamics: Conservation of Energy CH110 FA11 SAS 3 KINETIC ENERGY POTENTIAL ENERGY • mechanical (moving mass ½ mv 2 ) [ joule = kg m 2 /s 2 ] • mechanical (mass in a place where force can act) • chemical (bonds) • nuclear (binding energy) • electrical (moving charge) • light (photons) • sound (molecules moving uniformly) • heat (molecules moving randomly) Energy ______ converted from one form to another When it is converted, the total energy _______________
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Change in Internal Energy CH110 FA11 SAS 4 E = E final – E initial E is a state function System Surroundings energy Surroundings System energy • Energy is conseved: All energy lost by a system under observation is gained by the surroundings State function: • Internal energy is the capacity to: • Thermal energy ( _____ ) is energy transferred due to difference in temperature
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lecture38_chem110_sas - Chemical Reactions: Thermochemistry...

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